I am leaving for Iraq next month and upon my return I will be getting the new Chrysler 300C. I have a current sound system with my Mitsubishi Eclipse GT. The difference with the cars is I currently have a hatchback vs a trunk on the new 07.
I only have experience iwth the hatchback with it the Eclispe being my first car with a aftermarket sound system.

Anyone with any experience with the 300C as far as speaker size and Amps. I have always used Rockford Fosgate for both amps and speakers for the Eclipse. I am trying to see what others are using in the 300C.

I've rented the 300s many times and I think you'll be surprised by what is hidden beneath the speaker covers. I think the front door panels might be able to hold a component system with 8" woofers and a midrange. The car has some definite possibilities but might require a bit of custom work.